Mold



Nov. 29, 1927.

MOLD

W. M. SHEFFIELD i Filed April 21, 1927 ATTORNEY atentd Nov. 29, 1927.

WILLIAM MOBBOW SHEFFIELD, OF NEW YORK, N. Y.

Application filed April 21, 1927. Serial No. 185,405.

My invention relates to lam'inated molds i. e. molds composed of a plurality of thin plates, or laminee, preferably of metal, firnly elamped together, the edges of which plates are cut or for-med so as to roduce the article to be moldecl. Such mol s are used in pulp molding machines Operating with a vacuum causing the pulp to adhere to the face of the mold, while the water is drained ofl. One

difliculty with these molds is to separate the molded article from the mold, and the object of the present invention is to produce a mold of the type referred to, in which the plates or laminae can be moved relatively to each other, after the clamping pressure has been relieved, in the direction of the mold surface,'-

so as to thereby easily and quickly separate the molded article from the mold.

On the annexed drawing, on which I have shown, by way' of illustration, one embodiment of a m'old made in accordance with my invention, Fig. 1 is a top plan View of the mold, the clamping frame being shown in section along line 1-1 in Fig. 2; Fig. 2 is a section along line 2-2 in Fig. 1; Figs. 3 and 4 show two of the platespor laminae; Fig. 5 is a diagram to show the cam action for imparting relative movement to the plates.

As shown, the mold is composed of a plurality of thin plates, or laminee, 1, 1 wlfch are placedin an open clamping frame 2 comprising the side walls 3 and 4, the top and bottom walls 5 and 6, and the rear wall 7, within which walls the plates 1 and 1 are snugly held in close juxtaposition, as indicated in Fig. 1. Within the iframe 2 is' also provided a wedge-plate 8 and a wedge 9 in engagement with said wedge-plate. In the position of the wedge-plate 8 and wedge 9 shown in Fig. 1, the plates, or laminae 1 1 are clamped firmly and immovably in position so that the mold cut, or otherwise formed, in the front edges of the plates and indicated at 10 in Figs. 1 and 2 will not be disturbed during the molding operation..

On its rear side, the wedge 9 has centrally arranged therein a threaded bore 11. into which enters the threaded stem 12 of a crank 13, whereby the wedge 9 can be moved into or out of the frame 2 to thereby either tighten or release the plates. It will be appreciated that only a comparatively slight dsplacement of wedge 9 will suflice to accomplish this purpose. The crank 13 has its hearing in the rear Wall 7 of the frame.

As will be seen from Figs. 3 and 4:, the alternate plates 1 and 1* are provided with round and oblong apertures 14 and 15 respectively for the reception of rods 16 and stems 17. The rods 16 serve as guide-rods, whereas the stems 17 are Operating stems used for causing the relative movement of the plates. The stems 17, as will be seen from Figs. 1 and 2, are engaged at their outwardly projecting ends by arms 18 and 19 carried on a shaft 20 enclosed within a cylindrical sleeve 21 extending across the frame 2 back of its rear wall 7. In the downwardly extending rear members 22 of the frame is journalled a shaft 23 hearing, or. formed with, a cam 24. The latter engages the hub; or boss, 25 of a link 26 extending rearwardly from sleeve 21, which is secured to Shaft 20 by a set-screw 27. At the one end of shaft 23 is Secured thereto a lever 28. When the lever 28 occupies the position shown in Figs. 1 and 2 and indicated by I in Fig. 5, the cam 24 occupies an intermediate position, 'in which case the plates` or laminee composing the mold are in normal position, i. e. presenting an uninterrupted mold surface; If the lever 28 is rocked to the position marked IIin Fig. 5, the cam 24 by its cam action pulls the link' 26 and thereby the arms'18 and 19 toward the right in Figs. land 2,`so that the alternate laminae 1* (Fig. 4) of the mold are moved back from the mold surface. Then, if lever 28 is rocked to .the position III in Fig. 5, the alternate laminae 1 are moved forward (i. e. toward the left in Figs. 1 and 2) just enough beyond the mold surface as to separate therefrom the m'olded article. The elongated apertures 15 in the laminae 1 allow them to be moved relative to the laminae L the elongated apertures 15 in which permit the to and fro movement therein of the Operating rods 17 As'indicated in Fig. 1, similar elongated openings are provided in the side walls 3 and 4 of the frame, the wedge-plate &and wedge 9.

At 29 in Fig. 2 is indicated a set-screw serving as an abutment for the lever 28 so as to determine its normal position, in which the laminated mold is ready`for the molding operation.

It is obvious that the embodiment shown in the drawing is for purposes of illustration only, because the same inventon may also be used on laminated molds of the hollow type, such as shown and described in my Patent No. 1,605,358. Moreover, other means than those shown for causing the relative movement of the laminae of the mold may be used, and other changes may be made without a departure from the esscncc of my invention.

I claim:

1. A mold comprising a plrality of lamina capable of relative to and fro movement in' the direction of the mold surface.

2. A mold com rising a plurality of laminze capable of re ative to and fro movement in the direction of the mold surface, and a means for clamping said laminae together when occupying the molding osition.

3. A mold comprising a p urality of laminae capable of relative to and fro movement in the' direction of the mold surface, and a means for guiding said laminae during their relative movement.

'4. A mold comprising a plurality of closely contacting la'ninae capable of to and from movement n the direction of the mold surface, said laminae having apertures, and guide-rods extending through said apertures.

5. A mold comprisin a plurality of laminne capable of to and o movement in the direction of the mold surface, means for guiding., said laminaa, and a means for displacing said laminae in alternate groups.

6. A mold comprising a plurality of closely contacting lamjnae capable of to and fro movement in the direction of the mold surface and having apertures, guide-rods extendin through said apertures, a means for disp acing said laminae in alternating' sequence, and a means for clamping said laminw together when occupying the molding position.

7. In combination with a frame, a plurality of laminae contained in said frame and capable of to and fro movement therein in the direction of the mold surface. means for gniding said' laminae, a means for dsplacing the same in alternate uence, and a means for clamping said lamne together when occpying the molding position.

8. In combnation with a frame, a plurality of laminae contained in said frame in close contact with each other and capable of to andfro movement in the direction of the mold surface, said lamine having slots, guide-rods extending through said Slots, Operating rods engaging said laminae for displacing the same, and a single actuating means for actuating said Operating rods.

9. In combnation with a frame, aplurality of laminae in close contact with each other and capable of relativeto and fro movement in the direction of the mold surface, a means -for immovably clamping said laminae together, a means for' relieving said laminae from clamping pressure, and a means for displacing said laminae.

10. In combination with a frame, a plurality of laminae in close contact with each other and capable of relative to and fro movement in the direction of the mold surface, a means for immovably clamping said laminae together, a means for relieving said laminae from clamping pressure, a means for displacing said laminae, and a means for determining the molding position of 'said laminae.

In testimony whereof I aflix my signature. 30

WILLIAM MORROW SHEFFIELD. 

